Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hieu van » thien van, lieu va, hieu ve
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hac tuc » thac toc, thai tuc
tuc van » thuc van, truc van, tuc va
nang xa » nang x, lang xa, nang ma
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang xa) or (dang xay)) hoi. ((hieu van) or (hieu va)) hac tuc van hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (dang xay)) hoi. ((hieu van) OR (hieu va)) hac tuc van hanh va cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (dang xay)) hoi. ((hieu van) or (hieu va)) hac tuc van hanh va cua triet*.